WO2021166461A1 - Procédé de production de papier d'aramide recyclé - Google Patents

Procédé de production de papier d'aramide recyclé Download PDF

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Publication number
WO2021166461A1
WO2021166461A1 PCT/JP2020/049089 JP2020049089W WO2021166461A1 WO 2021166461 A1 WO2021166461 A1 WO 2021166461A1 JP 2020049089 W JP2020049089 W JP 2020049089W WO 2021166461 A1 WO2021166461 A1 WO 2021166461A1
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aramid
paper
aramid paper
pulp
dried
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PCT/JP2020/049089
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English (en)
Japanese (ja)
Inventor
竜士 藤森
成瀬　新二
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デュポン帝人アドバンスドペーパー株式会社
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Priority to KR1020227025910A priority Critical patent/KR20220113826A/ko
Priority to CN202080097118.4A priority patent/CN115087776A/zh
Publication of WO2021166461A1 publication Critical patent/WO2021166461A1/fr

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/26—Polyamides; Polyimides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/32—Defibrating by other means of waste paper
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Definitions

  • the present invention relates to a method for producing recycled aramid paper.
  • Aramid paper is a paper manufactured from a material having improved strength and thermal stability.
  • Aramid paper is a synthetic paper made of aromatic polyamide, has excellent heat resistance, flame resistance, electrical insulation, toughness and flexibility, and has been used as an electrical insulating material and a base for aircraft honeycombs.
  • paper containing Nomex® fibers from DuPont (USA) is a slurry in which poly (metaphenylene isophthalamide) flocs and fibrids are mixed in water and mixed. It is manufactured by making paper and processing it on a calendar. This paper has high strength and toughness as well as excellent electrical insulation even at high temperatures.
  • Patent Document 1 describes aramid paper containing aramid paper pulp produced by crushing dried aramid paper to a size that allows it to pass through a 6.4 to 12.7 mm sieve. It is disclosed.
  • Patent Document 1 does not specify the characteristics of aramid paper pulp that can be used as a raw material for paper, and if the micronization treatment for reuse is insufficient, paper pieces can be contained in the aramid paper pulp.
  • the raw material that retains its shape remains, and if paper is produced using the raw material in this state, the appearance and thickness of the paper will be uneven, which is not preferable.
  • An object of the present invention is to provide a method for producing recycled aramid paper, which uses aramid paper pulp made by reusing aramid paper, has sufficient mechanical properties, and has a good appearance.
  • the method for producing recycled aramid paper includes a disintegration step of disintegrating a piece of dried aramid paper formed from aramid short fibers and aramid fibrid in water to obtain aramid paper pulp, and papermaking of the paper pulp. It is characterized in that the aramid paper pulp is disintegrated so that the disintegration degree is 93% or more in the disintegration step including the papermaking process. According to the above-mentioned method for producing recycled aramid paper, in the disintegration step, the aramid paper pulp is disintegrated so that the degree of disintegration is 93% or more, so that the raw material in which the shape of the paper piece remains in the aramid paper pulp can be obtained. It is possible to obtain recycled aramid paper having almost no residue, improved mechanical properties, and a good appearance.
  • a miniaturization treatment step of performing a miniaturization treatment on aramid pulp and paper is further included.
  • the particle size of the piece of aramid paper can be reduced, and high-quality aramid paper can be recycled.
  • the aramid paper in the disintegration step, is dissociated using a disintegrator configured to generate a stirring force in the vertical direction in water.
  • Aramid paper has a low affinity for water, and even if a piece of aramid paper is dropped into water, the piece of paper floats on the surface of the water, and the dissociation does not proceed sufficiently.
  • the disintegration step is performed by a disintegrator configured to generate a stirring force in the vertical direction, so even a piece of aramid paper having a large size can be used.
  • the aramid paper can be disintegrated and reused as a raw material for papermaking. This makes it possible to reuse the dried aramid paper as a raw material for papermaking without crushing it into small pieces.
  • the crushing / cutting step of crushing and / or cutting the dried aramid paper to obtain a piece of paper is further included, and in the crushing / cutting step, the dried aramid paper has a maximum dimension of more than 12.7 mm. Crush and / or cut. Since aramid paper has a low affinity for water, a large piece of paper having a maximum size of more than 12.7 mm floats on the surface of the water, and disintegration does not proceed. On the other hand, according to the above-mentioned method for producing recycled aramid paper, the piece of aramid paper has a maximum size of more than 12.7 mm because the piece of paper sinks into water and circulates due to the stirring force in the vertical direction. However, it can be dissociated.
  • aramid paper pulp is mixed with aramid fibrid and / or aramid short fibers. According to the above-mentioned method for producing recycled aramid paper, recycled aramid paper having further improved mechanical performance can be obtained.
  • a recycled aramid paper having appropriate mechanical properties and a good appearance by using aramid paper pulp obtained by reusing scraps and damaged materials generated during papermaking of aramid paper.
  • a manufacturing method is provided.
  • the aramid means a linear polymer compound in which 60% or more of the amide bonds are directly bonded to the aromatic ring.
  • examples of such an aramid include polymetaphenylene isophthalamide and its copolymer, polyparaphenylene terephthalamide and its copolymer, and copolyparaphenylene 3,4'-diphenyl ether terephthalamide.
  • These aramids are industrially produced by, for example, a solution polymerization method by a condensation reaction with an aromatic acid dichloride and an aromatic diamine, a two-step interfacial polymerization method, etc., and can be obtained as commercial products. , Not limited to this.
  • polymetaphenylene isophthalamide is preferably used because it has properties such as good molding processability, heat adhesion, flame retardancy, and heat resistance.
  • the aramid fibrid is a film-like fine particle composed of aramid, and is sometimes referred to as aramid pulp.
  • Aramid fibrid has paper-making properties like ordinary wood (cellulose) pulp, and can be formed into a sheet by a paper machine after being dispersed in water.
  • a so-called beating process can be performed for the purpose of maintaining the quality suitable for papermaking. This beating process can be performed by a disc refiner, beater, or other papermaking raw material processing device that exerts a mechanical cutting action.
  • the morphological change of the fibrid can be monitored at the drainage degree (freeness) specified in JIS P8121.
  • the drainage degree of the aramid fibrid after the beating treatment is preferably in the range of 10 to 300 cm 3 (Canadian standard freeness). Aramid fibrids with a drainage level greater than 300 cm 3 may reduce the strength of the sheet material formed from it.
  • an aramid binder with a drainage degree smaller than 10 cm 3 is to be obtained, the utilization efficiency of the mechanical power to be input becomes small, the processing amount per unit time is often small, and further, the aramid five Since the lid is miniaturized too much, the so-called binder function is likely to deteriorate.
  • the aramid short fiber is a heat-resistant short fiber obtained by cutting a fiber made from aramid into a predetermined length, and examples of such a fiber include "Teijin Cornex (Teijin Co., Ltd.). Examples include, but are not limited to, those that can be obtained under trade names such as “Registered Trademarks)” and “Nomex (Registered Trademarks)” by DuPont.
  • the length of the aramid short fibers can generally be selected from the range of 1 mm or more and less than 25 mm, preferably 2 mm or more and less than 12 mm. If the length of the short fibers is smaller than 1 mm, the mechanical properties of the sheet material deteriorate, while if the short fibers are 25 mm or more, "entanglement” and “binding” occur during the production of aramid paper by the wet method described later. It is not preferable because it easily causes defects.
  • the fiber diameter of the aramid short fibers can be selected from the range of 0.1 to 40 ⁇ m, preferably 0.5 to 25 ⁇ m, and more preferably 1 to 20 ⁇ m.
  • the dried aramid paper is a sheet-like material mainly composed of the above-mentioned aramid fibrid, aramid short fibers, or a mixture thereof, and is described separately from the "aramid paper” described later.
  • the dried aramid paper generally has a thickness in the range of 20 ⁇ m to 1000 ⁇ m, and the dried aramid paper generally has a thickness in the range of 10 g / m 2 to 1000 g / m 2 , preferably 10 g / m 2 to 500 g / m 2 .
  • Dried aramid paper is generally produced by a method of mixing the above-mentioned aramid fibrid and aramid short fibers, and then forming the mixed aramid fibrid and aramid short fibers into a sheet. Specifically, for example, a method in which aramid fibrid and aramid short fibers are dry-blended and then a sheet is formed using an air flow, aramid fibrid and aramid short fibers are dispersed and mixed in a liquid medium, and then liquid permeable.
  • a method of discharging the material onto a support, for example, a net or a belt to form a sheet, removing the liquid and drying the material can be applied, and among these, a so-called wet method of using water as a medium is preferably selected.
  • the mixing ratio of the aramid fibrid and the aramid short fiber is arbitrary, but the ratio (mass ratio) of the aramid fibrid / aramid short fiber is preferably 1/9 to 9/1, more preferably 2 It is better to set it to / 8 to 8/2.
  • a single or mixed aqueous slurry containing at least aramid fibrid and aramid short fibers is sent to a paper machine to be dispersed, dehydrated, squeezed and dried, and then wound up as a sheet.
  • a paper machine a long net paper machine, a circular net paper machine, an inclined paper machine, a combination paper machine combining these, and the like are used.
  • a composite sheet composed of a plurality of paper layers can be obtained by forming a sheet of slurries having different compounding ratios and coalescing them. Additives such as dispersibility improvers, defoamers, and paper strength enhancers are used during papermaking as needed.
  • thermal pressure processing It is known that the dried aramid paper obtained as described above is subjected to thermal pressure processing at high temperature and high pressure between a pair of rolls to improve density, crystallinity, heat resistance, dimensional stability and other mechanical strength. Has been done.
  • the conditions for thermal pressure processing can be, for example, in the range of a temperature of 100 to 350 ° C. and a linear pressure of 50 to 400 kg / cm when a metal roll is used, but the conditions are not limited thereto. Multiple aramid papers can also be laminated during thermal pressure. Further, the above-mentioned thermal pressure processing can be performed a plurality of times in any order.
  • the aramid paper pulp refers to the above-mentioned dried aramid paper crushed and / or cut into small pieces.
  • the method for producing pulp and paper according to the present embodiment is a disintegration step in which dried aramid paper is put into water and the aramid paper is disintegrated to obtain heat-resistant pulp and paper, and a wet method in which the heat-resistant pulp and paper is subjected to a wet micronization treatment. Manufactured by performing a micronization process. Further, a crushing / cutting step of crushing or cutting the aramid paper to obtain a piece of paper may be performed before the disintegration step, a dust removal step may be performed after the disintegration step, or a dust prevention step may be performed after the wet miniaturization treatment step. A wet sieving step may be performed.
  • the dried aramid paper (hereinafter referred to as “dried aramid paper”) is disintegrated in water using a disintegrator having a stirring force in the vertical direction.
  • a disintegrator having a stirring force in the vertical direction for example, a pulper, a kneader, an intensityer pulper having a rotor arranged on the side surface (wall surface) of the tab, and the like are preferably used, but the present invention is not limited thereto.
  • FIG. 1 is a perspective view showing a configuration of a disintegrator used in the method for producing pulp and paper according to the present embodiment.
  • the disengagement machine 1 is a so-called insulator, and includes a tab 6, a motor 2, and a rotor 4.
  • the tab 6 includes a bottom surface 6A arranged obliquely and a side wall 6B erected upward on the edge of the bottom surface 6A.
  • the tab 6 is supported by connecting the lower surface of the bottom surface 6A to a plurality of leg members 8.
  • the lengths of the plurality of leg members 8 are different, and the legs 4 are supported so that the side on which the rotor 4 is provided is located downward.
  • the bottom surface 6A has an elliptical shape and is inclined downward toward the rotor 4.
  • the side wall 6B extends vertically upward from the edge of the bottom surface 6A, and the tip portion has a tapered shape toward the center.
  • a circular opening is formed in the portion surrounded by the upper end edge of the side wall 6B.
  • the rotor 4 is composed of a plurality of blades extending radially outward from the center on the upper surface of a circular disk.
  • the rotor 4 is provided at one end of the tab 6 along the long axis of the bottom surface 6A, and is located at the bottom of the bottom surface 6A.
  • the rotor 4 is connected to the rotation shaft of the motor 2 arranged below the tab 6. The rotor 4 rotates by driving the rotation shaft of the motor 2 to rotate.
  • baffle 10 extending in the vertical direction along the side wall 6B is provided inside the tab 6, a baffle 10 extending in the vertical direction along the side wall 6B is provided.
  • the baffle 10 is provided at the other end of the tab 6 along the long axis of the bottom surface 6A.
  • the baffle 10 has a triangular horizontal cross section, and its width and depth increase upward.
  • the baffle 10 extends in the vertical direction over substantially the entire length of the side wall 6B.
  • the tab 6 of the release machine 1 is filled with water.
  • a swirling flow centered on the rotation axis of the rotor 4 is generated over the entire vertical direction. Since the bottom surface 6A of the tab 6 is inclined downward toward the rotor 4, the swirling flow in the vicinity of the bottom surface 6A of the tab 6 becomes an upward flow. Further, when the swirling flow collides with the baffle 10, a downward flowing flow is generated. As a result, an ascending flow flowing from the bottom to near the surface and a descending flow flowing from near the surface to the bottom are generated in the tab 6, and these ascending and descending flows act as a stirring force for stirring the paper piece in the vertical direction. .. Further, the piece of paper existing at the bottom of the tab 6 is raised by the ascending flow, and the piece of paper existing near the water surface is drawn to the bottom of the tab 6 by the descending flow and cut by the blade of the rotor 4.
  • dried aramid paper has a low affinity for water and does not sink in water simply by contacting it with water. For this reason, in low-concentration pulpers and high-concentration pulpers having a rotor at the center of the bottom surface of a cylindrical tab, which is used for disintegrating pulp fibers made of wood pulp, for example, dry aramid paper and water are difficult to mix and disintegration does not proceed. Therefore, it is difficult to industrially produce aramid pulp and paper.
  • the size (or maximum dimension) of the long side of the dried aramid paper to be put into water in the disintegration step is a size exceeding 12.7 mm, preferably 50 mm or more.
  • the finer the size the higher the specific surface area of the dried aramid paper, which improves the affinity with water as described above, but dust is generated in the crushing / cutting process. It is easy to handle, which is not preferable in terms of the working environment in the crushing / cutting process, and the smaller the size, the lower the crushing efficiency. It is not preferable because it becomes difficult.
  • the dimensions and shape of the dried aramid paper to be put into water are not limited to this, and the dried aramid paper to be put into water may have a continuous sheet shape in the disintegration step.
  • the continuous sheet shape means a sheet having a long side of 1 m or more, and the width is 10 to 3000 mm, preferably 50 to 2000 mm, depending on the size of the tab of the releaser.
  • the concentration of the dried aramid paper in the above-mentioned disintegration step is 1.0 to 7.0% by weight, preferably 1.5 to 6.0% by weight, and more preferably 2.0 to 5.0% by weight.
  • concentration of the dried aramid paper is less than 1.0% by weight, the amount of dissociated aramid paper pulp (hereinafter, sometimes referred to as dissociated aramid paper pulp) obtained is relatively small, and in terms of energy and production efficiency. If it exceeds 7.0% by weight, the viscosity of the slurry becomes too high at the time of disaggregation, and it becomes difficult to proceed with disaggregation.
  • the liquid temperature of the aramid pulp and paper suspension in the disintegration step is 10 to 80 ° C., preferably normal temperature to 70 ° C.
  • an additive such as a dispersibility improver, a defoaming agent, a paper strength enhancer, or a disintegration accelerator which can be added at the time of the above-mentioned papermaking may be used.
  • the dried aramid paper Before the dried aramid paper is put into the disintegrator, if the dried aramid paper is large with respect to the opening of the tab 6, the dried aramid paper is subjected to a crushing / cutting step.
  • the crushed / cutting step the dried aramid paper is crushed and / or cut into pieces having a long side (maximum dimension) of more than 12.7 mm, more preferably a long side of 50 mm or more.
  • the long side (maximum dimension) of the dried aramid paper is preferably 1000 mm or less.
  • the crushing method is not particularly specified, but a method of crushing by a dry method is preferable.
  • a shredder is preferably used because there is little variation in size at the time of cutting and dust is less likely to be generated.
  • the heat-resistant pulp and paper thus obtained can be subjected to a wet miniaturization step of performing a wet miniaturization treatment.
  • Wet miniaturization treatment is a method of impacting aramid paper in an aqueous medium to reduce the particle size, and equipment that efficiently carries out such miniaturization treatment includes high-speed disintegrators, refiners, beaters, etc.
  • the present invention is not limited to these.
  • the degree of disintegration is mentioned as an index of the characteristics of the heat-resistant pulp and paper that can be subjected to the wet micronization treatment, and in the present embodiment, the degree of disintegration is 30% or more, preferably 35% or more. If the size of the piece of dried aramid paper is large, the disintegration is insufficient and there is a possibility that a large piece of paper may remain in the pulp and paper. May cause clogging. Therefore, particularly when the size of the dried aramid paper to be put into water during the disintegration step is 50 mm or more, the disintegration degree is preferably 30% or more.
  • the degree of disintegration is defined as JIS P8232, which is a plate having a slit gap of 150 ⁇ m, which is equivalent to 10 g of absolute dryness of heat-resistant pulp and paper disintegrated using an experimental screen device in which a screen plate is arranged. It is expressed by the absolute dry weight ratio of the heat-resistant pulp and paper that has passed through the screen to the total weight of the charged heat-resistant pulp and paper, and is calculated by the following formula.
  • the degree of disintegration of the aramid paper pulp used for the recycled aramid paper is 93% or more, preferably 94%, more preferably 95% or more.
  • the degree of dissociation is less than 93%, undissociated pieces of paper become apparent on the surface of the sheet when the sheet-like material is formed, resulting in poor appearance and non-uniform thickness of the obtained sheet, which is not preferable.
  • the recycled aramid paper refers to a sheet-like material containing the above-mentioned aramid paper pulp, and generally has a thickness in the range of 20 ⁇ m to 1000 ⁇ m like the above-mentioned dried aramid paper. There is. Further, the recycled aramid paper of the present embodiment generally has a basis weight in the range of 10 g / m 2 to 1000 g / m 2 , preferably 10 g / m 2 to 500 g / m 2.
  • the content of the aramid paper pulp in the total weight of the recycled aramid paper of the present embodiment is not particularly limited as long as it achieves the desired properties, but in order to maintain the process strength during the production of the recycled aramid paper. 1 to 90% by weight is preferable, 1 to 80% by weight is preferable in order to more sufficiently develop the process strength, and 1 to 70% by weight is further preferable to sufficiently develop the electrical insulation characteristic of the aramid paper. Is particularly preferable.
  • the balance may be, but is not limited to, new aramid fibrids, or a combination of these with aramid short fibers.
  • the recycled aramid paper of the present embodiment is produced by the paper pulp obtained by the above-mentioned method for producing paper pulp alone, or by a method of mixing paper pulp with aramid fibrid, aramid short fibers, and the like and then forming a sheet. NS.
  • a method can be applied in which fibers and the like are dispersed and mixed in a liquid medium and then discharged onto a liquid-permeable support, for example, a net or a belt to form a sheet, and the liquid is removed and dried.
  • the so-called wet manufacturing method which uses the above as a medium, is preferable.
  • an aqueous slurry containing at least the above-mentioned aramid pulp and / or aramid fibrid is sent to a paper machine to disperse it, and then dehydrated, squeezed and dried. , It is a method of winding up as a sheet.
  • a paper machine a long net paper machine, a circular net paper machine, an inclined paper machine, a combination paper machine combining these, and the like are used.
  • a composite sheet composed of a plurality of paper layers can be obtained by forming a sheet of slurries having different compounding ratios and coalescing them. Additives such as dispersibility improvers, defoamers, and paper strength enhancers are used during papermaking as needed.
  • fibrous components for example, aramid fiber, polyphenylene sulfide fiber, polyether ether ketone fiber, cellulose fiber, PVA fiber, polyester fiber, allylate fiber, liquid crystal polyester fiber, polyimide fiber and other organic fibers, etc.
  • Inorganic fiber glass fiber such as glass fiber, rock wool, asbestos, and boron fiber
  • the ratio of the aramid short fibers to the total constituent fibers is 80% by weight or more, more preferably 90% by weight or more.
  • the aramid fibrid has excellent properties as a binder, so that fine particles and other additive components can be efficiently captured. Then, in the production of the aramid paper of the present embodiment, the raw material yield is improved, and at the same time, the sheets are stacked in layers in the sheet, the through holes can be reduced, and the electrical insulation property is improved.
  • the recycled aramid paper thus obtained can be heat-pressed at high temperature and high pressure between a pair of flat plates or between metal rolls to improve the density and mechanical strength.
  • the conditions for thermal pressure processing include, but are not limited to, a temperature of 100 to 350 ° C. and a linear pressure of 50 to 400 kg / cm. It is also possible to simply press at room temperature without applying a heating operation. It is also possible to stack a plurality of recycled aramid papers during thermal pressure processing. It is also possible to perform the thermal pressure processing of the above a plurality of times in any order.
  • the following effects are exhibited.
  • the aramid paper pulp in the disintegration step, is disintegrated so that the degree of disintegration is 93% or more, so that almost no paper piece having a shape remains in the aramid paper pulp, and the mechanical properties are improved. It is possible to obtain recycled aramid paper which is improved and has a good appearance.
  • the aramid paper pulp includes the pulverization treatment step of performing the pulverization treatment, the particle size of the paper piece of the aramid paper can be reduced, and the high quality aramid paper can be regenerated. ..
  • aramid paper has a low affinity for water, and even if a piece of aramid paper is dropped into water, the piece of paper will float on the surface of the water and will not be sufficiently dissociated. In particular, when the size of the aramid paper is large, it is difficult to sink in water.
  • the disintegration step is performed by the disintegrator 1 configured to generate a stirring force in the vertical direction, the paper piece is on the water surface even if it is a large piece of aramid paper. Since it sinks into water and circulates, the aramid paper can be dissociated and reused as a raw material for papermaking. This makes it possible to reuse the dried aramid paper as a raw material for papermaking without crushing it into small pieces.
  • the dried aramid paper is crushed and / or cut so that the maximum size exceeds 12.7 mm.
  • aramid paper Since aramid paper has a low affinity for water, a large piece of paper with a maximum size of more than 12.7 mm floats on the surface of the water, and disintegration does not proceed. On the other hand, according to the present embodiment, the piece of paper sinks into the water and circulates due to the stirring force in the vertical direction, so that even a piece of aramid paper having a maximum size exceeding 12.7 mm is dissociated. be able to.
  • the aramid paper pulp is mixed with the aramid fibrid and / or the aramid short fibers, a recycled aramid paper having further improved mechanical performance can be obtained.
  • the absolute dry weights of the aramid pulp and paper that passed through the screen and the aramid pulp and paper remaining on the screen were measured and calculated by the following formula.
  • Sheet basis weight, thickness and density were measured according to JIS C 2300-2, and the density was calculated by (basis weight / thickness).
  • a fibrid of polymethaphenylene isophthalamide was produced by a method using a pulp particle production apparatus (wet precipitator) composed of a combination of a stator and a rotor described in JP-A-52-15621. This was treated with a breaker and a beater to prepare a length-weighted average fiber length of 0.9 mm (aramid fibrid drainage degree: 100 ml (Canadian standard freeness)). On the other hand, a meta-aramid fiber manufactured by DuPont (Nomex (registered trademark), single yarn fineness 2 denier) was cut to a length of 6 mm to obtain an aramid short fiber.
  • a pulp particle production apparatus wet precipitator
  • a breaker and a beater to prepare a length-weighted average fiber length of 0.9 mm (aramid fibrid drainage degree: 100 ml (Canadian standard freeness)
  • a meta-aramid fiber manufactured by DuPont Nomex (registered trademark), single yarn fine
  • Examples 1 to 3 The above disaggregated aramid paper pulp was diluted to a concentration of 1.0% and passed through a refiner (manufactured by Kumagai Riki Kogyo Co., Ltd., disc refiner) at a flow rate of 50 L / min with a minimum clearance to obtain aramid paper pulp.
  • the prepared aramid pulp and paper, aramid fibrid, and aramid short fibers were dispersed in water to prepare a slurry. These slurries were mixed so as to have the blending ratio (weight ratio) shown in Table 1, and recycled aramid paper was prepared by a tappy type hand-making machine (cross-sectional area 625 cm 2).
  • the prepared recycled aramid paper was hot-pressed with a metal calendar roll at a temperature of 330 ° C. and a linear pressure of 300 kg / cm to obtain a calendar-processed recycled aramid paper.
  • Table 1 shows the main characteristic values of the aramid pulp and paper thus obtained and the regenerated aramid paper processed by the calendar.
  • the aramid fibrid and aramid short fibers prepared in the above raw material preparation 1 were each dispersed in water to prepare a slurry. These slurries were mixed so that the blending ratio (weight ratio) of aramid fibrid and aramid short fibers was 1/1, and a sheet-like product was prepared by a tappy hand-making machine (cross-sectional area 625 cm 2). .. Next, the sheet-like material was hot-pressed with a metal calendar roll at a temperature of 330 ° C. and a linear pressure of 300 kg / cm to obtain a calendar-processed recycled aramid paper. Table 1 shows the main characteristic values of the calendar-processed recycled aramid paper thus obtained.
  • the calendar-processed recycled aramid papers obtained in Examples 1 to 3 have the same density and tensile strength as the conventional examples, although they contain a high proportion of aramid paper pulp.
  • the appearance is also good, although a few pieces of paper are confirmed, and the appearance after heat treatment does not change, which is useful as an aramid paper for applications such as electrically insulating paper.
  • Example 4 and 5 The disaggregated aramid pulp obtained in the above raw material preparation 2 is diluted to a concentration of 1.0% and passed through a refiner (manufactured by Kumagai Riki Kogyo Co., Ltd., a disc refiner) at a flow rate of 50 L / min with a minimum clearance, and then further.
  • Aramid pulp was obtained by passing through a wet sieve having an opening diameter of 1.4 mm.
  • the prepared aramid pulp and paper, aramid fibrid, and aramid short fibers were dispersed in water to prepare a slurry.
  • the calendar-processed recycled aramid papers obtained in Examples 4 and 5 have the same density and tensile strength as the conventional examples, although they contain a high proportion of aramid paper pulp. , Further, by increasing the degree of disintegration of the mixed aramid pulp and paper, a good appearance was exhibited.
  • the calendar-processed aramid papers of Comparative Examples 1 and 2 have a low degree of separation of the mixed aramid paper pulp, so that the density, thickness unevenness, and tensile strength are inferior to those of the examples, and the sheet appearance is also poor. ..

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Abstract

La présente invention concerne un procédé de production de papier d'aramide recyclé présentant des caractéristiques mécaniques adéquates et un bon aspect, ledit procédé utilisant de la pâte à papier d'aramide qui est obtenue en réutilisant du papier d'aramide.　Ce procédé comprend : une étape de désintégration dans laquelle de la pâte à papier d'aramide est obtenue par désintégration de morceaux de papier d'aramide sec, qui est formé à partir de fibres courtes d'aramide et de fibride d'aramide, dans de l'eau au moyen d'une machine de désintégration (1) ; et une étape de fabrication de papier pour la fabrication du papier de la pâte à papier. Dans l'étape de désintégration, la pâte à papier d'aramide est désintégrée de telle sorte que le degré de désintégration est de 93 % ou plus.
PCT/JP2020/049089 2020-02-21 2020-12-28 Procédé de production de papier d'aramide recyclé WO2021166461A1 (fr)

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KR1020227025910A KR20220113826A (ko) 2020-02-21 2020-12-28 재생 아라미드지의 제조 방법
CN202080097118.4A CN115087776A (zh) 2020-02-21 2020-12-28 再生芳纶纸的制造方法

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JP2020027846A JP7373430B2 (ja) 2020-02-21 2020-02-21 再生アラミド紙の製造方法

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KR20240103357A (ko) * 2022-12-27 2024-07-04 도레이첨단소재 주식회사 내열지 제조방법, 이를 통해 제조된 내열지, 이를 포함하는 고내열 전기 절연재료 및 고내열 구조재료

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JPH04228696A (ja) * 1990-06-14 1992-08-18 E I Du Pont De Nemours & Co アラミド紙パルプを含有するアラミド紙
JPH07243189A (ja) * 1994-03-01 1995-09-19 Teijin Ltd 多孔性アラミド成形物の製造方法
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CN115087776A (zh) 2022-09-20
JP2021130893A (ja) 2021-09-09
KR20220113826A (ko) 2022-08-16
JP7373430B2 (ja) 2023-11-02

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